class_docstr: Main class for calculating GageRnR.
docstr: Calculate Mean of Squares.
docstr_tok: ["Calculate","Mean","of","Squares","."]
code: def calculate_ms(self, dof, SS):
      """Calculate Mean of Squares."""
      MS = dict()
  
      for key in SS:
          MS[key] = SS[key] / dof[key]
      return MS
  
imports: from enum import Enum
  import numpy
  import math
  import scipy.stats
label_desc: Use image node_id 7 for calling the GageRnR obj's underlying member method code with example usage: obj.calculate_ms(dof, SS) and returns: MS